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Q. No.Given below are two statements:
Assertion (A):
A black body is an ideal body that emits and absorbs radiation of all frequencies.
Reason (R):
The frequency of radiation emitted by a body goes from lower frequency to a higher frequency with an increase in temperature.
1.
Both (A) and (R) are True and (R) is the correct explanation of (A).
2.
Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.
(A) is True but (R) is False.
4.
(A) is False but (R) is True.
Subtopic: Planck's Theory |
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Given below are two statements:
| Statement I: | The frequency at which wavelength of 400 nm is 9.50×1014Hz. |
| Statement II: | The frequency at which wavelength of 750 nm is 4.00×1014 Hz. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Photo Electric Effect |
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In which of the following transitions of hydrogen atom, radiation of minimum frequency is emitted ?
1. n2 = \(\infty\) to n1 = 1
2. n2 = 2 to n1 = 1
3. n2 = 3 to n1 = 2
4. n2 = \(\infty\) to n1 = 3
Subtopic: Hydrogen Spectra |
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| Assertion (A): | Angular momentum of the electron in the orbit that has four subshells is \(2h\over\pi\). |
| Reason (R): | Angular momentum of the electron is quantized. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Bohr's Theory |
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| Assertion (A): | The kinetic energy of photo-electrons increases with an increase in the frequency of incident light where v>v0. |
| Reason (R): | Whenever the intensity of light is increased the number of photo-electron ejected always increases. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Planck's Theory |
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| Assertion (A): | The energy of an electron is largely determined by its principal quantum number. |
| Reason (R): | The principal quantum number is a measure of the most possible distance of finding the electron around the nucleus. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Quantum Numbers & Schrodinger Wave Equation |
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Consider the given two statements:
Select the correct option:
| Assertion (A): | The absorption spectrum consists of some bright lines separated by dark spaces. |
| Reason (R): | The emission spectrum consists of dark lines. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Type of Spectra |
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Match List I with List II
Choose the correct answer from the options given below:
| List I (Frequency region) | List II (Uses) |
| A. Radiofrequency | I. Radar |
| B. Microwave | II. Broadcast |
| C. Infra-red region | III. Heating |
| A | B | C | |
| 1. | II | I | III |
| 2. | I | II | III |
| 3. | I | III | II |
| 4. | II | III | I |
Subtopic: Electromagnetic Radiation |
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A golf ball has a mass of 46 g and a speed of 45 m/s. If the speed can be measured within the accuracy of 3%, the uncertainty in the position is:
1. 8.4×10-34m
2. 6.4×10-33m
3. 6.6×10-39m
4. 2.1×10-34m
1. 8.4×10-34m
2. 6.4×10-33m
3. 6.6×10-39m
4. 2.1×10-34m
Subtopic: Heisenberg Uncertainty Principle |
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The variation of radial probability density R2(r) as a function of distance (r ) of the electron from the nucleus for 3p-orbital is captured in which of the following graphs?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Nodal Plane |
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